The car was travelling along Grantham Road in Birkdale, Merseyside when the incident happened at 3.15pm.
The spokesman for the midfielder said: "Steven was driving very slowly through an area of Birkdale when a young boy ran out and hit the side of his car. Steven comforted the boy until the paramedics arrived.
"There were apparently several eye-witnesses who saw the accident.
"Steven later attended a police station where he produced his driving documents as a matter of routine and made a statement about the accident.
"The Liverpool captain was distressed over the accident and has been in contact with the boy's family to check his progress and plans to visit him in the next couple of days."